Thermosensitive recording material

Abstract

To provide a thermosensitive recording material, which contains: a base; a thermosensitive coloring layer containing a leuco dye and a color developer; at least one protective layer containing a resin, a crosslinking agent, and wax, wherein the thermosensitive coloring layer is disposed on the base, and the protective layer is disposed on the thermosensitive coloring layer, and wherein the resin is reactive carbonyl group-containing polyvinyl alcohol, the crosslinking agent is a hydrazide compound, and the wax is oxidized polyethylene wax.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a thermosensitive recording material for use in the fields of printers for computer output or calculator, recorders for medical instrumentation, low-speed or high speed printers, automatic ticket machines, thermosensitive copying, handy terminals, and labels such as POS system.[0003]2. Description of the Related Art[0004]Conventionally, various proposals have been made in a recording material having a thermosensitive recording layer, which contains as main components a colorless or pale color leuco dye and a color developer for coloring the leuco dye, disposed on a base of paper, synthesized paper, plastic film or the like, and which uses a coloring reaction initiated by applying heat, pressure, or the like to the thermosensitive recording layer. This type of the thermosensitive recording material has advantages such that complicated processes such as developing, fixing, and the like are...

AI Technical Summary

Benefits of technology

[0017]The present invention aims at solving various problems in the art, and achieving the following object. Namely, an object of the present invention is to provide a thermosensitive recording material, which can be stably provided without being affected by the surrounding environment, and can improves anti-sticking property in high temperature and high humidity environment.

[0018]As a result of the diligent studies and researches conducted by the present inventors, the present inventors have come to the insight such that stable supplies are possible without being affected by the natural environment, and head-matching property, plasticizer resistance, water resistance, and conveying property at high temperature and high humidity can be improved with a desirable balance by providing a thermosensitive coloring layer, which contains a leuco dye and a color developer for coloring the leuco dye, and a protective layer on the thermosensitive coloring layer, using a reactive carboxyl group-containing polyvinyl alcohol as a resin for the protective layer, a hydrazine compound as a crosslinking layer, and oxidized polyethylene wax as wax (i.e. a lubricant) for the protective layer. The present invention is based upon the aforementioned insight of the present inventors.

[0035]According to the present invention, various problems in the art can be solved, the aforementioned object can be achieved, and a thermosensitive recording material, which can be stably supplied without being affected by the natural environment, has the improved head-matching property, plasticizer resistance, water resistance, and conveying performance at high temperature and high humidity with desirable balance, can be provided.

Problems solved by technology

Moreover, in recent years, printing has been often performed by a printer of low torque, because of the trends for energy saving, or downsizing so as to use as a portable handy type of the printer.

Use of zinc stearate and calcium stearate as the wax agent improves the head matching property, but calcium stearate does not provide a sufficient lubricating effect.

Moreover, though zinc stearate gives a sufficient lubricating effect, it reduces the plasticizer resistance of the thermosensitive recording material.

Furthermore, zinc, which is a main substance of zinc stearate, is regarded as a compound which possibly adversely affect water environment, and use of such material is not very suitable in recent years (see, for example, Japanese Patent (JP-B) No. 2812040).

However, as both wax use natural materials as a main substance, there is a possibility that a supply thereof is unstable depending on the change in the natural environment.

In such case, the original lubricating function cannot be performed, and it is not suitable for mass-production.

These raw materials have a difficulty in stable supply due to the changes in the natural environment, or depletion of raw materials.

However, even with this non-oxidized polyethylene wax, a sufficient lubricating function cannot be attained.

However, in this technique, sufficient conveying performance cannot be attained in the high temperature and high humidity environment.

Therefore, desirable functions cannot be attained.

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